US8121021B2 - Data transmission method for orthogonal frequency division multiplexing system - Google Patents

Data transmission method for orthogonal frequency division multiplexing system Download PDF

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US8121021B2
US8121021B2 US12/518,623 US51862309A US8121021B2 US 8121021 B2 US8121021 B2 US 8121021B2 US 51862309 A US51862309 A US 51862309A US 8121021 B2 US8121021 B2 US 8121021B2
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frequency division
division multiplexing
orthogonal frequency
data transmission
cyclic prefix
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US20100303168A1 (en
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Shuqiang Xia
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

Definitions

  • the present invention relates to the field of broadband wireless communication, and more specifically, to a data transmission method for the technical field of orthogonal frequency division multiplexing (OFDM) system.
  • OFDM orthogonal frequency division multiplexing
  • the OFDM technique gains more and more attentions and is recommended as the preferred technique of the broadband wireless communication.
  • the data transmission method is very important.
  • a data transmission unit (such as one frame of OFDMA system based on 802.16, or a subframe in LTE OFDM system) has several OFDM symbols, and at the front of each OFDM symbol, there is a cyclic prefix which is usually the repeat of last data segment of the OFDM symbol.
  • the OFDM system can not only eliminate the inter-symbol interference caused by multiple paths, but also ensure that the carriers are orthogonal with each other to guarantee the spectrum utility efficiency of the OFDM system. Therefore, the setting of the cyclic prefix in the data transmission unit is very important and how to reasonably set the cyclic prefix has profound significance for the OFDM system.
  • each bandwidth corresponds to a setting of cyclic prefix, and the cyclic prefixes of different bandwidths are not compatible, which increase the complexity of system implementation but without any extra gain.
  • 6 system bandwidths have 8 cyclic prefix lengths: 4.69, 5.21, 4.95, 4.82, 4.75, 4.73, 4.77 and 4.79 us, and since it is quite practical that the users with different bandwidths need to communicate with each other, each user should match with 8 different cyclic prefixes when accessing to the system, thus increasing the time to access to the system and the difficulty of implementation.
  • the time lengths of the cyclic prefixes with different bandwidths are the same, and the distinctness that different data should use different cyclic prefixes is not considered.
  • the broadcast data means the data, such as the pilot frequency, important system messages, which should be received by all users in the service area of the BS.
  • the BS When the BS sends these messages, it should guarantee that the users in the bad channel environment (for example, those users at the edge of the cell) can correctly receive these important messages, and thus the BS should select OFDM symbols with relatively long cyclic prefix when sending these messages.
  • the unicast message means the data sent to a certain user by the BS, and at this time, the BS should use OFDM symbol with relatively short cyclic prefix to ensure the system's efficiency.
  • the present invention offers a data transmission method for OFDM system to meet the compatibility of the time lengths of cyclic prefixes with different bandwidths and the distinctness that different data should use different cyclic prefixes.
  • the present invention offers a data transmission method for the OFDM system, which specifically comprises sending M, which is greater than 1, OFDM symbols included in each data transmission unit with different bandwidth, wherein each data transmission unit with different bandwidth sends two kinds of OFDM symbols with different cyclic prefix lengths: OFDM symbols with the long cyclic prefixes and OFDM symbols with the short cyclic prefixes; and the data transmission units with different bandwidths transmit the identical number of OFDM symbols with the long cyclic prefixes and the identical number of the OFDM symbols with the short cyclic prefixes.
  • the data transmission units with different bandwidths transmit the OFDM symbols with long cyclic prefix at any same position, such as the first symbol position of different data transmission units.
  • the method of the present invention offers a data transmission method for OFDM system, which can meet the compatibility requirements of the time lengths of the cyclic prefixes with different bandwidths and the distinctness that different types of data should use different cyclic prefixes, and thus it can facilitate the popularization of the OFDM technique in the field of broadband wireless communication.
  • FIG. 1 illustrates the present setting of cyclic prefix in “3GPP, TR25.814”
  • FIG. 2 illustrates an embodiment of setting cyclic prefix in “3GPP, TR25.814” in accordance with the present invention.
  • FIG. 1 vividly shows the settings of cyclic prefixes with different bandwidths based on the setting of cyclic prefix in “3GPP, TR25.814” in Table 1.
  • the vertical line block indicates the OFDM symbols with the long cyclic prefixes in the subframe; and the cross line block indicates the OFDM symbols with short cyclic prefix in the subframe.
  • FIG. 1 it can be seen that, in each channel bandwidth, there are two symbols with different cyclic prefix lengths in each subframe, and in the subframes with different bandwidths, the number of the OFDM symbols with the long cyclic prefixes (or short cyclic prefix) is not the same.
  • the time lengths of the long cyclic prefix and the short cyclic prefix are also variable. As above mentioned, the incompatibility of the cyclic prefix lengths will cause big trouble for the system implementation and user's access.
  • the length of a subframe is 0.5 ms.
  • the length of the long cyclic prefix is (10/1.92) us, and that of the short cyclic prefix (9/1.92) us.
  • the length of the cyclic prefix the following two factors should be considered: (a). the target application environment of the system, for different application environments, the required lengths of the cyclic prefixes are not the same. For example, for a typical mobile communication system, a preferred length of the cyclic prefix is generally in the range of 4 ⁇ 6 us; (b). the lengths of the two cyclic prefixes should be integer multiples of the sampling interval corresponding to the lowest bandwidth of the system. How to select the right length belongs to the prior art and will not be discussed here.
  • the duration of a data transmission unit is T D
  • the time length of the OFDM symbols after removing the cyclic prefix is T S
  • the time length of the long cyclic prefix is T A
  • the time length of the short cyclic prefix is T B
  • the following table provides the cyclic prefix in the OFDM system described in 3GPP, TR25.814 after using the method of the present invention:
  • FIG. 2 illustrates the setting of cyclic prefix in 3GPP, TR25.814 after applying the method of the present invention. From FIG. 2 and Table 3, it can be seen that each bandwidth defines two kinds of cyclic prefix lengths, and different bandwidths have the same two cyclic prefix lengths.
  • This setting has considered not only the compatibility of the time lengths of the cyclic prefixes with different bandwidths, but also the distinctness that different data should use different cyclic prefixes, and thus has the advantages of simplified implementation and reduced user access time.
  • the position of the OFDM symbol with a long cyclic prefix in the subframe is constant, for example, specifying that the first symbol in the subframe is an OFDM symbol with long cyclic prefix can increase the speed and accuracy of system synchronization.
  • the other positions of OFDM symbols with the long cyclic prefixes in the subframe can be specified, and after the positions of the OFDM symbols with the long cyclic prefixes are determined, so are the positions of the OFDM symbols with the short cyclic prefixes.
  • the method of the present invention offers a data transmission method for OFDM system, which can meet the compatibility requirements of the time lengths of the cyclic prefixes with different bandwidths and the distinctness that different data should use different cyclic prefixes, and thus is good for the popularization of the OFDM technique in the field of broadband wireless communication.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/518,623 2006-12-15 2006-12-15 Data transmission method for orthogonal frequency division multiplexing system Active 2027-07-08 US8121021B2 (en)

Applications Claiming Priority (1)

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PCT/CN2006/003422 WO2008071039A1 (fr) 2006-12-15 2006-12-15 Procédé de transmission de données pour système de multiplexage par répartition orthogonale de la fréquence

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US8121021B2 true US8121021B2 (en) 2012-02-21

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EP (1) EP2104253A4 (de)
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WO (1) WO2008071039A1 (de)

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Publication number Priority date Publication date Assignee Title
US8565082B1 (en) 2011-03-25 2013-10-22 Sprint Spectrum L.P. Method and system for selecting cyclic prefix length based on access point load
US8422577B1 (en) 2011-03-25 2013-04-16 Sprint Spectrum L.P. Method and system for selecting cyclic prefix length based on signal quality reports
US20130163501A1 (en) * 2011-12-22 2013-06-27 Qualcomm Incorporated Flexible cyclic prefix management
US9838173B1 (en) 2016-12-05 2017-12-05 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for transmission in a wireless communication network

Citations (5)

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US5818813A (en) 1995-09-06 1998-10-06 Advanced Digital Television Broadcasting Laboratory Orthogonal frequency division multiplexing transmission system and transmitter and receiver adapted to the same
US6115354A (en) 1994-07-20 2000-09-05 Timlar Konle Multiple carrier transmission in common-wave networks
CN1476189A (zh) 2002-07-29 2004-02-18 ���ǵ�����ʽ���� 适应信道特性的正交频分复用通信方法和设备
US20070189289A1 (en) * 2005-12-27 2007-08-16 Nokia Corporation Apparatus, method and computer program product providing frequency domain multiplexed multicast and unicast transmissions
US7885295B2 (en) * 2005-06-17 2011-02-08 Telefonaktiebolaget Lm Ericsson (Publ) Communication resource management

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CN102143119B (zh) * 2005-03-30 2016-03-16 苹果公司 正交频分多路复用符号的传输方法和系统

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Publication number Priority date Publication date Assignee Title
US6115354A (en) 1994-07-20 2000-09-05 Timlar Konle Multiple carrier transmission in common-wave networks
US5818813A (en) 1995-09-06 1998-10-06 Advanced Digital Television Broadcasting Laboratory Orthogonal frequency division multiplexing transmission system and transmitter and receiver adapted to the same
CN1476189A (zh) 2002-07-29 2004-02-18 ���ǵ�����ʽ���� 适应信道特性的正交频分复用通信方法和设备
US20040037215A1 (en) 2002-07-29 2004-02-26 Samsung Electronics Co., Ltd. Orthogonal frequency division multiplexing communication method and apparatus adapted to channel characteristics
US7885295B2 (en) * 2005-06-17 2011-02-08 Telefonaktiebolaget Lm Ericsson (Publ) Communication resource management
US20070189289A1 (en) * 2005-12-27 2007-08-16 Nokia Corporation Apparatus, method and computer program product providing frequency domain multiplexed multicast and unicast transmissions

Non-Patent Citations (3)

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Title
3GPP TR 25.814 V0.1.2 (Jun. 2005), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Aspects for Evolved UTRA (Release 7).
3GPP TR 25.814, V7.0.0; "Physical Layer Aspects for evolved Universal Terrestrial Radio Access (UTRA) (Release 7)"; Jun. 2006. *
International Search Report for PCT/CN2006/003422 (WO 2008/071039 A1) Issued Sep. 27, 2007.

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WO2008071039A1 (fr) 2008-06-19
US20100303168A1 (en) 2010-12-02
CN101536377A (zh) 2009-09-16
EP2104253A4 (de) 2014-01-15
EP2104253A1 (de) 2009-09-23

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